US Design Patented Cover is dual-coated and made out of heavy duty 24oz. marine-grade vinyl, with built-in horizontal crossbars that offer support when cover is lying flat; and roll up with the tarp to provide full bed access when in need. Also comes with aircraft-grade aluminum side rails, and stainless steel clamps for mounting to the truck bed. Seals with Velcro strip on the sides and secures with latch lock system at the tailgate. Tension system is available and can be adjusted on the end of the side rails to keep the cover tight and vinyl wrinkle-free in any weather conditions. Easy no drilling installation with instruction and mounting hardware provided. | NOTE: Small holes will need to be cut in the bedliner for vehicles equipped with over-the-bedrail bedliner to secure the clamps for proper cover installation; cover will work with under-the-bedrail bedliner without modification. LIMITED LIFETIME WARRANTY | IMPORTANT: Please measure your truck bed size before ordering. We accept returns; however customer will assume the return shipping cost if ordered wrong.